One parent stated that the existing crest had been obliterated by a felt-tip doodle.
Satellite photography was available from 1964, but was of a poor quality and was given on paper, with the coastline etched in felt-tip pen.
Often there was graduation from small cartridge sketch pads to larger tracing sheets with a corresponding change from early pencil sketches to felt-tip pen and colour marker.
Fortunately a felt-tip pen was sufficient to activate the switch.
Pens or markers with hard tips, or with solvents that can affect the protective layers, can scratch or damage the data layer; water-based felt-tip pens are safest.
He also madeusing the new-at-the-the-time felt-tip pensintricate black-and-white mandala-like drawings, many of which he subsequently (in the very early 1970s) lithographed into prints.
His tools were consistent, staying with ink, pencil, coloring pencils, and felt-tip pens throughout the years.
On the other hand, felt-tip pen is generally the preferred medium for the remaining architects interviewed.
